ARROW-18391: [R] Fix the version selector dropdown in the dev docs

[thisisnic]

For context, this overrides the default navbar HTML with a custom version which makes a single change - adding a span called "version" which the JS will override. An identically-named span existed in the template used with Bootstrap 3, which is why no JavaScript changes were needed. This approach is almost identical to that in this PR to the pkgdown package which implements the same thing: r-lib/pkgdown#2072

I built this locally, and it appears to have successfully added the dropdown back in.

[github-actions]

https://issues.apache.org/jira/browse/ARROW-18391

[github-actions]

⚠️ Ticket has not been started in JIRA, please click 'Start Progress'.

[kou]

Can I confirm what problem is fixed by this?

I confirmed the current https://arrow.apache.org/docs/r/ . The version dropdown shows "10.0.0.9000 (dev)" not "10.0.0 (release)". Is it a problem that is fixed by this PR?

I also confirmed that "9.0.0" in https://arrow.apache.org/docs/r/ can move to https://arrow.apache.org/docs/9.0/r/ . I think that it's expected.
I also confirmed that "10.0.0 (release)" in https://arrow.apache.org/docs/9.0/r/ can move to https://arrow.apache.org/docs/r/ . I think that it's expected too.

[thisisnic]

Can I confirm what problem is fixed by this?

I confirmed the current https://arrow.apache.org/docs/r/ . The version dropdown shows "10.0.0.9000 (dev)" not "10.0.0 (release)". Is it a problem that is fixed by this PR?

I also confirmed that "9.0.0" in https://arrow.apache.org/docs/r/ can move to https://arrow.apache.org/docs/9.0/r/ . I think that it's expected. I also confirmed that "10.0.0 (release)" in https://arrow.apache.org/docs/9.0/r/ can move to https://arrow.apache.org/docs/r/ . I think that it's expected too.

The problem is that in a recent PR (since 10.0.1) we upgraded to Bootstrap 5 from Bootstrap 3. In the HTML templates which the pkgdown package (used to generate the docs) uses, there is a span called "version" in the template for Bootstrap 3 but not for Bootstrap 5. The JavaScript we use to implement the version switcher replaces that span with the version switcher. In the dev docs, the version switcher is not working because of this: https://arrow.apache.org/docs/dev/r/

I'll update the title to make that more clear, as it's not apparent, sorry.

[kou]

Thanks.
I understand.

I couldn't confirm the change details but +1 because you showed that it works on your local.

[ursabot]

Benchmark runs are scheduled for baseline = 7f04d91 and contender = f51ea4d. f51ea4d is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Finished ⬇️0.0% ⬆️0.0%] ec2-t3-xlarge-us-east-2
[Failed ⬇️0.31% ⬆️0.03%] test-mac-arm
[Failed ⬇️0.3% ⬆️0.0%] ursa-i9-9960x
[Finished ⬇️0.1% ⬆️0.0%] ursa-thinkcentre-m75q
Buildkite builds:
[Finished] f51ea4de ec2-t3-xlarge-us-east-2
[Failed] f51ea4de test-mac-arm
[Failed] f51ea4de ursa-i9-9960x
[Finished] f51ea4de ursa-thinkcentre-m75q
[Finished] 7f04d919 ec2-t3-xlarge-us-east-2
[Failed] 7f04d919 test-mac-arm
[Failed] 7f04d919 ursa-i9-9960x
[Finished] 7f04d919 ursa-thinkcentre-m75q
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java

[ursabot]

['Python', 'R'] benchmarks have high level of regressions.
ursa-i9-9960x